Improvement in spring tilting chairs



2 Sheets-Sheet 1.

A. B. STEVENS.

SPRING TILTING-CHAIR. No. 175K195. Patented March 21, 1876.

2 Sheets--Sheet Z.

A. B. STEVENS.-

srmm TIL'I'ING-GHAIR. No. 175,195. Patented March 21,1876.

N. PETERS, PNOTO-UTHOGRIPHER, WASHINGTON. D C- UNITED STATES PATENTOFFICE ASHER B. STEVENS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOHENRY S. HALE, ARTEMAS KILBURN, J. WARREN HALE, CHENEY KIL- BURN, ANDWARREN HALE, OF SAME PLACE.

IMPROVEMENT IN SPRING TILTING CHAIRS.

Specification forming part of Letters Patent No. 175,195, dated March21, 1876; application filed February 21, 1876.

i the chair for which Letters Patent No. 171,186

were granted to me and my assignees on the 14th of December, 1875 andthe object of my invention is to combine a seat, pivoted to a base orstand, with the springs described in w the said patent, so that while amore substantial support is afforded for the seat, the springs willafford the desired ease and comfort to the occupant of the chair.

In Figure 1, Sheet 1, of the accompanying drawings, the main support ofthe chair consists of two frames, A, connectedtogether by.

tie-rods 0..

Attached to or forming part of each frame is a plate, I), the upper endof which is hinged at w to a projection, d, on the under side of theseat B. To each projection d are secured the upper ends of the twocurved springs D D,

which are similar to those described in the aforesaid patent, and thelower ends of which are secured to the frame or base A, as shown. In myformer patent these springs formed the sole support for the seat, but Ihave found that a more substantial support can be made by pivoting theseat to the base, and combining with both the springs D D, in the mannerdescribed. Many different arrangements of stops for limiting thevibration of the seat may be adopted. In Fig. 1 a plate with aprojecting lip, e, is secured to each plate b, the contact of the lowerend of the projection d with this lip limiting the tilting movement ofthe seat in either direction. In the chair last described there are foursprings, but in the view below, Fig. 2, there are but two springs, theframe or base in this case consisting of four legs, united at the top toplates E, which are hinged to a single projection, d, on the under sideof the seat. The tilting movement is limited in this instance by theupper end m of the base or frame A. In Fig. 3, Sheet 2, the base iscomposed of two parts, A, to each of which is pivoted a plate, H,secured to the under side of the seat B, which is connected to the baseby two springs, D D, made in one piece, the vibration of the seat beinglimited by a lip, e, on each of the said plates H. The modification,Fig. 4, is substantially like the device shown in Fig. 1, Sheet 1, withthis exception, that but one spring, D, is shown in connection with eachframe or support, the springs being in front of the chair, the seat ofwhich, however, can be tilted both forward and backward, the stop 0preventing excessive tilting of the seat in either direction.. In Fig. 5the springs I) and D extend from the base to the seat, and are connectedby a block, 10, which is pivoted to the plate b of the base. In Fig. 6curved plates q q are secured to the under side of the seat, and areconnected together and to the springs D D by a block, 1;, the saidplates q q being carried downward, and serving, with a pin, 1, on thebase, to limit the vibration of the seat. The modification, Fig. 7, willbe readily understood without explanation.

I claim as my invention- The combination, in a spring tilting chair, ofa base, A, and seat, B, pivoted together, with the curved springs D Dsecured to the base and to the seat, all as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ASHER B. STEVENS.

Witnesses HARRY SMITH, HARRY HowsoN, Jr.

